This alarm is a new type which is focused on digital products with USB. It will make function when the line is broken or short circuit.
Features and specification: The capability is steady, and convenient to use It’s a full-new product for protection and security, it’s the ideal choice to product the cell phone, laptop, computer, digital camera and so on Voltage: 3 batteries of AA 1.5V When the volume becomes low obviously, please change the battery immediately. If you not use it in a long time, please take off the battery